Field TZIDC-110 Electro-Pneumatic Positioner

TZIDC-110 Electro-Pneumatic Positioner
for PROFIBUS PA
10/18-0.23 EN
Operation
General
The intelligent microprocessor-controlled TZIDC-110 positioner
is designed for achieving optimal results. Its stands out for quick
and precise control until reaching the set point and for high operational
reliability. The activation and adjustment of parameters
necessary to achieve this goal is done automatically by the Autoadjust
function. If required, the settings can be changed manually.
The total range of parameters includes:
• Operating parameters
• Adjustment parameters
• Monitoring parameters
• Diagnosis parameters
Operating parameters
The following operating parameters can be activated and
adjusted:
• Characteristic curve (travel = f {pos. signal})
linear,
equal percentage 1:25 or 1:50 or 25:1 or 50:1,
or user-configurable with 20 reference points
• Tolerance band
When reaching the tolerance band the position is considered
as having reached the setpoint. From this point on, the position
is further slowly re-adjusted until the dead band is reached.
The factory setting for this parameter is 0.3 %.
• Dead band (sensitivity)
When reaching the dead band, the position is held. The factory
setting for this parameter is 0.1 %.
Both the tolerance band and the dead band are automatically
determined during the positioner’s self-optimization.
• Travel limiting
The positioning travel, i.e. the stroke or angle of rotation, can
be reduced as required within the full range of 0...100%,
provided that a minimum value of 20% is observed.
• Shut-off function
This function can be selected separately for each end position.
When the respective configured limit value is exceeded, the
shut-off function causes immediate travel of the actuator until
reaching the set end position.
• Travel time prolongation
With this function the max. travel time for full travel can be increased.
This time parameter can be set separately for each direction
• Control in the end position
Here you can define whether the pneumatic actuator shall be
fully pressurized or the position shall be further controlled in the
end position. This parameter can be set separately for each
end position.
Adjustment parameters
The TZIDC-110 positioner has a special function (Autoadjust) for
automatic adjustment of all relevant parameters. The Autoadjust
function can be started by pressing the respective push-buttons
on the device’s front panel or by using the configuration program
on a remote PC.
The following parameters can be activated and adjusted:
• Control parameters
To adapt the TZIDC-110 positioner to the control action of the
valve, the control parameters can be adjusted individually to
achieve optimal control until reaching the set point.
• Valve range 0...100 %
Valve end positions, start of range "0 %” and end of range
"100 %".
• Effective direction of the actuator
Adjustment to either of the two possible directions:
Air to open/spring force to close
or
Air to close/spring force to open
• Display 0...100 %
Adjusting the display (0...100 %) to the direction of action for
opening or closing the valve.
Monitoring parameters
Various functions for permanent device monitoring are implemented
in the operating program of the TZIDC-110 positioner:
• Internal output circuit monitoring
• Monitoring to check whether or not the position is out of the
adjusted range (rotation angle) for position feedback.
• Monitoring for positioning time-out (adjustable time parameter)
• Monitoring of the stroke and travel counter to check if the limit
value is exceeded (limits can be adjusted during diagnosis)
While automatic commissioning is in progress, the current state
is continuously indicated on the integrated LC display. All other
messages can be called up for display via the graphical user
interface.
Extended monitoring is possible via the fieldbus. The most
important process variables like the output signal (in %), the position
(in %), the deviation (in %), and troubles occurring during
operation are indicated as plain text in a special line.
Diagnosis parameters
The diagnosis parameters of the TZIDC-110 program inform the
operator about the operating conditions of the valve. From this
information the operator can derive which maintenance works
are required, and when. Additionally, limit values can be defined
for these parameters. When they are exceeded, an alarm is
reported.
The following values are e.g. determined:
• Number of control actions performed by the valve
• Total stroking distance
The diagnosis parameters and limit values can be called up, set,
and reset via the fieldbus, by using the special TZIDC-110 configuration
program.
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